Escort L4-110 1.8L DOHC (1994)
At idle speed and up to 4,500 rpm, fuel is supplied by simultaneously providing one injection per crankshaft rotation (two injections per cycle) to
all cylinders. Therefore, one injection period supplies half of the fuel necessary for ideal combustion.
Between 4,500 and 6,000 rpm, the fuel injectors could remain fully open due to fuel injector lag, resulting in poor performance and fuel control.
For this reason, when the engine speed exceeds 4,500 rpm, there is a changeover to one injection per two crankshaft rotations (one injection per
cycle). The fuel injectors stay open longer and the time the fuel injectors remain closed is reduced. The amount of fuel necessary for ideal
combustion is supplied by one injection.
When engine speed reaches 6,300 rpm or higher, fuel injection is shut off in order to prevent engine over-speed, and possible engine damage.
